What is ERNiCrMo-3 Welding wire?
ERNiCrMo-3 welding wire also known as Incoloy 625 or Alloy 625 is a Nickel base TIG and MIG filler wire.
ERNiCrMo-3 is used to weld Ni-Cr-Mo alloy steels such as ASTM B443, ASTM B444 & B 446 types.
It can be used to weld these alloys as well their dissimilar welding to steel and other alloys.
The super-austenitic weld deposits of ERNiCrMo-3 can withstand from cryogenic temperature range from to 1000°F (540°C). The welding is crack resistance as well excellent weldability.
Inconel fillet metal 625 is the brand name from special metal for ERNiCrMo-3 wire.
ERNiCrMo-3 welding wire specification
ERNiCrMo-3 welding wire specification is AWS A5.11. The ISO specification for this wire is ISO 14172. AWS A5.11 covers nickel and nickel base alloys solid welding wire rods.
ERNiCrMo-3 Chemical Compositions
ERNiCrMo-3 is a Nickel base welding wire having main alloying elements as 61 Ni%, 22 Cr%, 9 Mo%, and 3.5% Nb plus Ta. Its UNS Number is N06625.
Detailed chemical compositions of ERNiCrMo-3 are listed in the below table:
| Element | Chemical Composition |
| C% | 0.10 maximum |
| Mn% | 0.50 maximum |
| Fe% | 5.0 maximum |
| P% | 0.02 maximum |
| S% | 0.015 maximum |
| Si% | 0.50 maximum |
| Cu% | 0.50 maximum |
| Ni% | 58.0 minimum |
| Al% | 0.40 maximum |
| Ti% | 0.40 maximum |
| Cr% | 20.0- 23.0 |
| Nb% + Ta% | 3.15- 4.15 |
| Mo% | 8.0- 10.0 |
| Other elements | 0.50 maximum |
ERNiCrMo-3 wire Mechanical Properties
ERNiCrMo-3 welding wire mechanical properties are specified in AWS A5.14 Table A.2. ERNiCrMo-3 tensile strength is 110 Ksi (760 MPa). The typical yield strength of ERNiCrMo-3 is 65 Ksi with a percentage elongation of around 35%.
- Tensile strength: 110 Ksi (760 MPa) as per AWS A5.14.
- Yield Strength: ≈ 66 Ksi (not specified in AWS A5.14).
- Elongation: ≈ 35% (not specified in AWS A5.14).
ERNiCrMo-3 A Number and F Number
ERNiCrMo-3 welding wire F Number is “43” as per ASME Section IX, Table QW-432. The A Number for ERNiCrMo-3 welding wire is not given in ASME Section IX.
ERNiCrMo-3 Equivalent wire
ISO 14172 equivalent wire of ERNiCrMo-3 is E Ni 6625. The equivalent stick welding electrode of ERNiCrMo-3 is ENiCrMo-3 (AWS A5.14).
DIN 1736 equivalent is SG-NiCr21Mo9Nb wire and ISO 18274 equivalent is SNi6625.
ERNiCrMo-3 Microstructure
The microstructure of ERNiCrMo-3 consists of austenite matrix containing gamma prime precipitates in the form of needle shaped particles.
The gamma prime precipitates are mostly made up of Ni3Nb intermetallic compound which reinforces the material at higher temperatures providing greater strength and stability.
Additionally, this alloy has good ductility and weldability making it an effective choice for critical components operating under harsh conditions.
ERNiCrMo-3 has a microstructure that consists mainly of chromium, nickel, molybdenum and iron.
This alloy is highly resistant to corrosion in hostile environments due to its high nickel content as well as its ability to form protective oxide layers on its surface.
ERNiCrMo-3 Welding Parameters
ERNiCrMo-3 welding wire is used for TIG and MIG welding of Inconel 601, 625 and alloy 800 welding.
ERNiCrMo-3 Welding parameters for TIG and MIG welding are:
| Wire diameter | Amperage | Voltage |
| 0 .035 ‘’ | 60-100 | 11-14 |
| 0.045’’ | 70-110 | 12-16 |
| 1/16’’ | 80-125 | 14-20 |
Pure argon gas is used for shielding for TIG & MIG welding using ERNiCrMo-3 welding wire.
ERNiCrMo-3 vs ERNiCrMo-4
ERNiCrMo-3 and ERNiCrMo-4 are both alloys of nickel, chromium and molybdenum.
They are most commonly used in welding applications due to their excellent corrosion resistance properties.
Both materials offer superior performance compared to other alloys, but it’s important to understand the differences between the two before making a decision on which one is best for your particular job.
The chemical composition comparison of both wires are given below:
| Element | Chemical Composition | Chemical Composition |
| C% | 0.10 maximum | 0.02 maximum |
| Mn% | 0.50 maximum | 1.0 maximum |
| Fe% | 5.0 maximum | 4.0- 7.0 |
| P% | 0.02 maximum | 0.04 maximum |
| S% | 0.015 maximum | 0.03 maximum |
| Si% | 0.50 maximum | 0.08 maximum |
| Cu% | 0.50 maximum | 0.50 maximum |
| Ni% | 58.0 minimum | Balance |
| Al% | 0.40 maximum | – |
| Ti% | 0.40 maximum | – |
| Cr% | 2.0- 23.0 | 14.5- 16.5 |
| Nb% + Ta% | 3.15- 4.15 | – |
| Mo% | 8.0- 10.0 | 15.0- 17.0 |
| V% | – | 0.35 maximum |
| W% | – | 3.0- 4.5 |
| Other elements | 0.50 maximum | 0.50 maximum |
ERNiCrMo-3 has lower corrosion resistance compared to ERNiCrMo-4 as ERNiCrMo-4 contains added tungsten (w) to increase its PREN. ERNiCrMo-4 (Alloy C276) PREN is 45.2 while ERNiCrMo-3 (alloy 625) is 40.8.
ERNiCrMo-3 and ERNiCrMo-4 both are nickel base solid TIG & MIG welding filler wires according to the AWS A 5.14 specification.
ERNiCrMo-3 is used for welding as ASTM B443, ASTM B444 & B 446 types alloys and ERNiCrMo-4 is used for welding ASTM B574, B575, B619, B622, and B626 types.
ERNiCrMo-3 is more common than ERNiCrMo-4, as it’s less expensive. ERNiCrMo-3 is known as Inco 625 while ERNiCrMo-4 is called Hastelloy C276 alloy.
ERNiCrMo-3 vs ERNiCr-3
ERNiCrMo-3 and ERNiCr-3 are two very similar nickel-chromium alloys, but there are some key differences between them.
ERNiCrMo-3 is a nickel-chromium alloy with molybdenum addition, while ERNiCr-3 does not include molybdenum.
This makes the latter alloy less resistant to high temperature oxidation and carburization than ERNiCrMo-3; however, it does offer superior corrosion resistance in many environments compared to its counterpart.
Additionally, the presence of molybdenum in ERNiCrMo-3 provides higher strength at elevated temperatures than what is achievable with ERNiCr-3.
ERNiCrMo-3 vs ERNiCrMo-10
ERNiCrMo-3 and ERNiCrMo-10 are both Nickel base welding wires as per AWS A5.14 specification.
The ERNiCrMo-10 contains added Vanadium and tungsten while ERNiCrMo-3 does not contains these elements.
Additions of these alloys gives excellent corrosion resistance to ERNiCrMo-10 compared to ERNiCrMo-3 welding wire.
On other side, ERNiCrMo-3 contains Niobium plus tantalum while ERNiCrMo-10 lacks these elements. ENiCrMo-10 is used for welding ASTM B574, B575, B619, B622 and B628 grades).
ERNiCrMo-3 welding wire Datasheet and MTC
Click here to download test certificate and datasheet for ERNiCrMo-3 welding wire.
ERNiCrMo-3 is an alloy welding wire used in many applications, and its datasheet and MTC are important documents that supply information about the product.
The ERNiCrMo-3 datasheet provides detailed specifications for the alloy, such as chemical composition, mechanical properties, electrode size and current range.
The material test certificate (MTC) is a quality assurance document that verifies that products conform to specified standards.
It contains information such as the manufacturer’s name, type of tests performed on the material along with their results, heat number etc., that can be used to trace back the history of each batch produced.
Thus, it is essential to have both these documents handy when working with ERNiCrMo-3 welding wire for assuring high quality welds.
